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IAUC 2866: 1975p; SN IN NGC 7723

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                                                  Circular No. 2866
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

     William A. Bradfield, Dernancourt, near Adelaide, cables that
he has discovered a comet.  The following positions are available:

     1975 UT             R. A. (1950) Decl.        m1    Observer
     Nov. 11.74       10 56.5       -37 41        10     Bradfield
          12.76       11 03.0       -38 30         9       "
          13.278      11 09 34      -38 55.9       8-9   Muller
          13.319      11 09 48      -38 57.9               "

W. A. Bradfield (Dernancourt).  Object diffuse, without condensation
   or nucleus, nothing reported about a tail.
A. B. Muller and H. E. Schuster (European Southern Observatory).
   Coma clearly visible.

     Although there seems to be some discordance in R.A., there is a
possibility that the comet belongs to the Kreutz sungrazing group,
in which case it would be at perihelion around Dec. 5.

     L. A. Thompson, Kitt Peak National Observatory, provides the
following photoelectric observations:

     1975 UT             V        B - V  U - B  V - R
     Oct. 30.131  13.95 +/- 0.02  +0.18  -0.23  +0.33  (+/- 0.01)
          31.122  13.89 +/- 0.02  +0.21  -0.29  +0.37  (+/- 0.01)

He adds that a spectrogram taken by G. Illingworth on Oct  30 shows
the supernova to be of type I.

     F. Ciatti, Asiago Astrophysical Observatory, writes: "An image-tube
spectrogram of the supernova was obtained on Oct. 29 with the
grating spectrograph attached to the 122-cm reflector.  The spectrum
(dispersion 125 A/mm) is that of a type I supernova a few days
after maximum.  Broad emission bands with maximum intensity near
6300, 5900, 5650, 5200, 4650 and 4200 A are present on a strong
continuum, with the characteristic absorption feature at 6150 A.  From
photographs taken with the 67-cm Schmidt telescope on Oct. 29 and
30 the B magnitude was estimated as about 14.25."

1975 November 13               (2866)              Brian G. Marsden

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